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Across 1. dark layer of the eye where blood vessels are found 3. region of the retina where there are no light receptors 5. coloured muscles that adjust the size of the pupil 6. used to adjust the thickness of the lens 8. the bending of light as it passes through the eye 10. an action that is rapid and involuntary 12. tough and white outer layer of the eye 15. the layer of cells containing light receptors 16. area of the retina with a high concentration of cones 17. the ciliary muscles relax when we are looking at these objects 18. shape of the len 19. these muscles contracts to dilate our pupils

Down 2. where the sensory neurones leave the eye 4. attaches the lens to the ciliary muscles 7. the receptors that are able to detect coloured light 9. in bright light the pupil does this 11. transparent section of the sclera 13. the receptors that work best in dim light conditions 14. the hole in the iris that allows light to enter the eye